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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Study on Metal Detection with an Electromagnetic Induction Probe Utilizing a Rotating Magnetic Field
Author(s)
Kiyoshi Koyama
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DOI:10.17265/2159-5275/2022.03.001
Affiliation(s)
College of Industrial Technology, Nihon University, Narashino Chiba 275-8575, Japan
ABSTRACT
The present paper describes an investigation conducted on metal detectors installed with a scanning probe. The authors applied a rotating magnetic field probe to metal detection. The rotating magnetic field probe is comprised of two vertically placed rectangular exciting coils and a circular detecting coil. The experimental results confirmed that the probe can detect metal objects and provide more information about their shape, direction, and electromagnetic characteristics than conventional metal detector probes. A two-dimensional signal display shows a low-resolution image of the metal object and the signal phase indicates the object’s direction and electromagnetic characteristics. The experimental results show that excellent reconstruction of the surface shapes of metal objects can be obtained for both magnetic and nonmagnetic metals under present conditions. There is also the potential for the approximate shape of a metal object to be estimated from the reconstructed image.
KEYWORDS
Metal detection, rotating magnetic field, MD (metal detector), image reconstruction, metal shape restoration.
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